Then I get:
$ LANG=de_DE gnucash
The font "-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*" does
not support all the required character sets for the current locale "de_DE"
(Missing character set "ISO8859-1")
(Missing character set "ISO8859-1")
Warning: gnucash_style_set_register...(): Cannot load font:
-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*
The font "-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*" does
not support all the required character sets for the current locale "de_DE"
(Missing character set "ISO8859-1")
(Missing character set "ISO8859-1")
Fatal Error: gnucash_style_set_register...(): Cannot load fallback
font: -adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*
The font "-adobe-helvetica-medium-o-normal--*-120-*-*-*-*-*-*" does
not support all the required character sets for the current locale "de_DE"
(Missing character set "ISO8859-1")
(Missing character set "ISO8859-1")
Warning: gnucash_style_set_register...(): Cannot load font:
-adobe-helvetica-medium-o-normal--*-120-*-*-*-*-*-*
The font "-adobe-helvetica-medium-o-normal--*-120-*-*-*-*-*-*" does
not support all the required character sets for the current locale "de_DE"
(Missing character set "ISO8859-1")
(Missing character set "ISO8859-1")
Fatal Error: gnucash_style_set_register...(): Cannot load fallback
font: -adobe-helvetica-medium-o-normal--*-120-*-*-*-*-*-*
The font "-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*" does
not support all the required character sets for the current locale "de_DE"
(Missing character set "ISO8859-1")
(Missing character set "ISO8859-1")
Fatal Error: gnucash_style_set_register...(): Cannot load fallback
font: -adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*
The font "-adobe-helvetica-medium-o-normal--*-120-*-*-*-*-*-*" does
not support all the required character sets for the current locale "de_DE"
(Missing character set "ISO8859-1")
(Missing character set "ISO8859-1")
Fatal Error: gnucash_style_set_register...(): Cannot load fallback
font: -adobe-helvetica-medium-o-normal--*-120-*-*-*-*-*-*

No, I didn't change that on purpose and actually I currently can't
view the Bug activity? I'm getting this when trying:
SELECT
COALESCE(fielddefs.description, chr(bugs_activity.fieldid)),
fielddefs.name,
bugs_activity.attach_id,
TO_CHAR(bugs_activity.bug_when, 'YYYY-MM-DD HH24:MI'),
bugs_activity.removed, bugs_activity.added,
profiles.login_name
FROM bugs_activity LEFT JOIN attachments
ON attachments.attach_id = bugs_activity.attach_id
LEFT JOIN fielddefs ON
bugs_activity.fieldid =
fielddefs.fieldid,
profiles
WHERE bugs_activity.bug_id = 136789
AND profiles.userid = bugs_activity.who AND
NOT(COALESCE(attachments.isprivate,0))
ORDER BY bugs_activity.bug_when: ERROR: Argument of NOT must
be type boolean, not type integer at globals.pl line 340.
Will try the fonts-xorg tomorrow, because my Notebook is currently out
of "fuel"...